Counting the state of a qubit
Ian S. Osborne · Science · 2018
Quantum Electronics Operation of a quantum computer will be reliant on the ability to correct errors. This will typically require the fast, high-fidelity quantum nondemolition measurement of a large number of qubits. Opremcak et al. describe a method that uses a photon counter to determine the state of a superconducting qubit. Being able to simply read out the qubit state as a photon number removes the need for bulky components and large experimental overhead that characterizes present approaches. Science , this issue p. [1239][1] [1]: /lookup/doi/10.1126/science.aat4625